Trait Visitor

Source

pub trait Visitor<T> {
Show 21 methods    // Required methods
    fn visit_expr(&mut self, expr: &Expr) -> T;
    fn visit_literal(&mut self, lit: &Literal) -> T;
    fn visit_null(&mut self) -> T;
    fn visit_identifier(&mut self, name: &str) -> T;
    fn visit_field_access(&mut self, receiver: &Expr, field: &str) -> T;
    fn visit_binary_op(
        &mut self,
        op: BinaryOperator,
        left: &Expr,
        right: &Expr,
    ) -> T;
    fn visit_unary_op(&mut self, op: UnaryOperator, operand: &Expr) -> T;
    fn visit_function_call(&mut self, name: &str, args: &[Expr]) -> T;
    fn visit_lambda(&mut self, param: &str, body: &Expr) -> T;
    fn visit_let(&mut self, name: &str, value: &Expr, body: &Expr) -> T;
    fn visit_if(
        &mut self,
        condition: &Expr,
        then_branch: &Expr,
        else_branch: &Expr,
    ) -> T;
    fn visit_array(&mut self, elements: &[Expr]) -> T;
    fn visit_object(&mut self, fields: &[(String, Expr)]) -> T;
    fn visit_pipe(&mut self, value: &Expr, functions: &[Expr]) -> T;
    fn visit_alternative(&mut self, primary: &Expr, alternative: &Expr) -> T;
    fn visit_guard(&mut self, condition: &Expr, body: &Expr) -> T;
    fn visit_date(&mut self, date: &str) -> T;
    fn visit_datetime(&mut self, datetime: &str) -> T;
    fn visit_duration(&mut self, duration: &str) -> T;
    fn visit_temporal_keyword(&mut self, keyword: TemporalKeyword) -> T;
    fn visit_string(&mut self, value: &str) -> T;
}

Expand description

Visitor trait for AST traversal and transformation

Implement this trait to traverse and/or transform ELO AST nodes. The generic type parameter T specifies the return type of visitor methods.

§Example

use elo_rust::ast::{Expr, Visitor};
use proc_macro2::TokenStream;

struct CodegenVisitor {
    // ... fields
}

impl Visitor<TokenStream> for CodegenVisitor {
    fn visit_expr(&mut self, expr: &Expr) -> TokenStream {
        match expr {
            Expr::Literal(lit) => self.visit_literal(lit),
            // ... handle other cases
        }
    }
}